Observations of the Circumstellar Water 110-->101 and Ammonia 10-->00 Lines in IRC +10216 by the Odin Satellite

Details Observations of the Circumstellar Water 110-->101 and Ammonia 10-->00 Lines in IRC +10216 by the Odin Satellite Observations of the Circumstellar Water 110-->101 and Ammonia 10-->00 Lines in IRC +10216 by the Odin Satellite

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...637..791h&link_type=abstract

The Astrophysical Journal, Volume 637, Issue 2, pp. 791-797.

Astronomy and Astrophysics

Astronomy

27

Stars: Circumstellar Matter, Molecular Processes, Stars: Agb And Post-Agb, Stars: Individual (Cw Leo)

Scientific paper

Submillimeter lines of H2O and NH3 have been detected in the carbon star IRC +10216 (CW Leo) with the Odin submillimeter satellite. The detection of the JK-,K+=110-->101 557 GHz line of ortho-H2O confirms the earlier detection in the same source with SWAS. The detection of the JK=10-->00 572 GHz line represents the first observation of the ground-state rotational transition of NH3 in a stellar envelope. By fitting a molecular line transfer model to the observed lines, we derive an ortho-H2O abundance of 2.4×10-6, which is consistent with estimates from the SWAS observation. The derived ortho-NH3 abundance of 1×10-6 relative to H2 is significantly higher than those derived from 24 GHz inversion transitions and is slightly higher than those from vibrational transitions in the infrared band. The high H2O and NH3 abundances in the carbon-rich star IRC +10216 underscore shortcomings in the conventional gas-phase LTE and non-LTE chemical models.

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